On Thu, Jul 20, 2000 at 12:08:48PM +0000, Erik Mouw wrote:> On Wed, 19 Jul 2000 16:39:06 +0200, David Balazic wrote:> > As I understand the BogoMIPS value is used for some fine grained> > delays. How does then the system survive a big change in the processor> > speed when :> > > > - user changes FSB on the fly ( possible with newer mainboards,> > I never tried it though )> > - CPU goes to lower clock due to power management> > - user (de)activates TURBO on older x86 computers> > The system survives the speed change very well. I've done clock scaling on> StrongARM SA1100 CPUs (see signature), and I could change the clock speed> from 59 to 265 MHz without problems. The proper implementation should

Depends on the drivers you're using - one of the SCSI drivers failed towork properly on certain alphas were udelay()'s speed varied by a factorof 2 depending on the next instruction after the udelay assembly (thishas been fixed now).

Fixing loops_per_sec to the highest possible value should always workthough.

-To unsubscribe from this list: send the line "unsubscribe linux-kernel" inthe body of a message to majordomo@vger.rutgers.eduPlease read the FAQ at http://www.tux.org/lkml/